<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
  <title>cltours</title>
  <link rel="stylesheet" href="static/font-awesome/css/font-awesome.css">
  <style>
    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
    }
    p{
      margin:0; 
      }
      a{
        text-decoration: none;
    color: #456789;
    font-size: 0.14rem;
      }
  </style>
</head>

<body>
  <div id="app"></div>
  <!-- built files will be auto injected -->
</body>
<script>
  var html = document.getElementsByTagName("html")[0];
  var width = document.body.clientWidth;
  var fontsize = width/4.14;
  html.style.fontSize=fontsize+"px"; 
    console.dir(html);
</script>

</html>